MAINTAINERS: Add Rick Edgecombe as a TDX reviewer

Rick worked extensively to enable TDX in KVM. He will continue to work
on TDX and should be involved in discussions regarding TDX.

Add Rick as a TDX reviewer.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20250708101922.50560-3-kirill.shutemov%40linux.intel.com

Author: kiryl

MAINTAINERS

@@ -27325,6 +27325,7 @@ F:	arch/x86/kernel/unwind_*.c
 X86 TRUST DOMAIN EXTENSIONS (TDX)
 M:	Kirill A. Shutemov <kas@kernel.org>
 R:	Dave Hansen <dave.hansen@linux.intel.com>
+R:	Rick Edgecombe <rick.p.edgecombe@intel.com>
 L:	x86@kernel.org
 L:	linux-coco@lists.linux.dev
 S:	Supported